1 // SPDX-License-Identifier: GPL-2.0-only
3 * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
5 * This file defines the sysfs class "hwmon", for use by sensors drivers.
7 * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12 #include <linux/bitops.h>
13 #include <linux/device.h>
14 #include <linux/err.h>
15 #include <linux/gfp.h>
16 #include <linux/hwmon.h>
17 #include <linux/idr.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
20 #include <linux/pci.h>
21 #include <linux/property.h>
22 #include <linux/slab.h>
23 #include <linux/string.h>
24 #include <linux/thermal.h>
26 #define CREATE_TRACE_POINTS
27 #include <trace/events/hwmon.h>
29 #define HWMON_ID_PREFIX "hwmon"
30 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
36 const struct hwmon_chip_info *chip;
37 struct list_head tzdata;
38 struct attribute_group group;
39 const struct attribute_group **groups;
42 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
44 #define MAX_SYSFS_ATTR_NAME_LENGTH 32
46 struct hwmon_device_attribute {
47 struct device_attribute dev_attr;
48 const struct hwmon_ops *ops;
49 enum hwmon_sensor_types type;
52 char name[MAX_SYSFS_ATTR_NAME_LENGTH];
55 #define to_hwmon_attr(d) \
56 container_of(d, struct hwmon_device_attribute, dev_attr)
57 #define to_dev_attr(a) container_of(a, struct device_attribute, attr)
60 * Thermal zone information
62 struct hwmon_thermal_data {
63 struct list_head node; /* hwmon tzdata list entry */
64 struct device *dev; /* Reference to hwmon device */
65 int index; /* sensor index */
66 struct thermal_zone_device *tzd;/* thermal zone device */
70 name_show(struct device *dev, struct device_attribute *attr, char *buf)
72 return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
74 static DEVICE_ATTR_RO(name);
77 label_show(struct device *dev, struct device_attribute *attr, char *buf)
79 return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label);
81 static DEVICE_ATTR_RO(label);
83 static struct attribute *hwmon_dev_attrs[] = {
89 static umode_t hwmon_dev_attr_is_visible(struct kobject *kobj,
90 struct attribute *attr, int n)
92 struct device *dev = kobj_to_dev(kobj);
93 struct hwmon_device *hdev = to_hwmon_device(dev);
95 if (attr == &dev_attr_name.attr && hdev->name == NULL)
98 if (attr == &dev_attr_label.attr && hdev->label == NULL)
104 static const struct attribute_group hwmon_dev_attr_group = {
105 .attrs = hwmon_dev_attrs,
106 .is_visible = hwmon_dev_attr_is_visible,
109 static const struct attribute_group *hwmon_dev_attr_groups[] = {
110 &hwmon_dev_attr_group,
114 static void hwmon_free_attrs(struct attribute **attrs)
118 for (i = 0; attrs[i]; i++) {
119 struct device_attribute *dattr = to_dev_attr(attrs[i]);
120 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
127 static void hwmon_dev_release(struct device *dev)
129 struct hwmon_device *hwdev = to_hwmon_device(dev);
131 if (hwdev->group.attrs)
132 hwmon_free_attrs(hwdev->group.attrs);
133 kfree(hwdev->groups);
138 static struct class hwmon_class = {
140 .owner = THIS_MODULE,
141 .dev_groups = hwmon_dev_attr_groups,
142 .dev_release = hwmon_dev_release,
145 static DEFINE_IDA(hwmon_ida);
147 /* Thermal zone handling */
150 * The complex conditional is necessary to avoid a cyclic dependency
151 * between hwmon and thermal_sys modules.
153 #ifdef CONFIG_THERMAL_OF
154 static int hwmon_thermal_get_temp(void *data, int *temp)
156 struct hwmon_thermal_data *tdata = data;
157 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
161 ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
171 static int hwmon_thermal_set_trips(void *data, int low, int high)
173 struct hwmon_thermal_data *tdata = data;
174 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
175 const struct hwmon_chip_info *chip = hwdev->chip;
176 const struct hwmon_channel_info **info = chip->info;
180 if (!chip->ops->write)
183 for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)
189 if (info[i]->config[tdata->index] & HWMON_T_MIN) {
190 err = chip->ops->write(tdata->dev, hwmon_temp,
191 hwmon_temp_min, tdata->index, low);
192 if (err && err != -EOPNOTSUPP)
196 if (info[i]->config[tdata->index] & HWMON_T_MAX) {
197 err = chip->ops->write(tdata->dev, hwmon_temp,
198 hwmon_temp_max, tdata->index, high);
199 if (err && err != -EOPNOTSUPP)
206 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
207 .get_temp = hwmon_thermal_get_temp,
208 .set_trips = hwmon_thermal_set_trips,
211 static void hwmon_thermal_remove_sensor(void *data)
216 static int hwmon_thermal_add_sensor(struct device *dev, int index)
218 struct hwmon_device *hwdev = to_hwmon_device(dev);
219 struct hwmon_thermal_data *tdata;
220 struct thermal_zone_device *tzd;
223 tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
228 tdata->index = index;
230 tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,
233 if (PTR_ERR(tzd) != -ENODEV)
235 dev_info(dev, "temp%d_input not attached to any thermal zone\n",
237 devm_kfree(dev, tdata);
241 err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
246 list_add(&tdata->node, &hwdev->tzdata);
251 static int hwmon_thermal_register_sensors(struct device *dev)
253 struct hwmon_device *hwdev = to_hwmon_device(dev);
254 const struct hwmon_chip_info *chip = hwdev->chip;
255 const struct hwmon_channel_info **info = chip->info;
256 void *drvdata = dev_get_drvdata(dev);
259 for (i = 1; info[i]; i++) {
262 if (info[i]->type != hwmon_temp)
265 for (j = 0; info[i]->config[j]; j++) {
268 if (!(info[i]->config[j] & HWMON_T_INPUT) ||
269 !chip->ops->is_visible(drvdata, hwmon_temp,
270 hwmon_temp_input, j))
273 err = hwmon_thermal_add_sensor(dev, j);
282 static void hwmon_thermal_notify(struct device *dev, int index)
284 struct hwmon_device *hwdev = to_hwmon_device(dev);
285 struct hwmon_thermal_data *tzdata;
287 list_for_each_entry(tzdata, &hwdev->tzdata, node) {
288 if (tzdata->index == index) {
289 thermal_zone_device_update(tzdata->tzd,
290 THERMAL_EVENT_UNSPECIFIED);
296 static int hwmon_thermal_register_sensors(struct device *dev)
301 static void hwmon_thermal_notify(struct device *dev, int index) { }
303 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
305 static int hwmon_attr_base(enum hwmon_sensor_types type)
307 if (type == hwmon_in || type == hwmon_intrusion)
312 /* sysfs attribute management */
314 static ssize_t hwmon_attr_show(struct device *dev,
315 struct device_attribute *devattr, char *buf)
317 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
321 ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
326 trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
329 return sprintf(buf, "%ld\n", val);
332 static ssize_t hwmon_attr_show_string(struct device *dev,
333 struct device_attribute *devattr,
336 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
337 enum hwmon_sensor_types type = hattr->type;
341 ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
346 trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
349 return sprintf(buf, "%s\n", s);
352 static ssize_t hwmon_attr_store(struct device *dev,
353 struct device_attribute *devattr,
354 const char *buf, size_t count)
356 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
360 ret = kstrtol(buf, 10, &val);
364 ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
369 trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
375 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
377 return (type == hwmon_temp && attr == hwmon_temp_label) ||
378 (type == hwmon_in && attr == hwmon_in_label) ||
379 (type == hwmon_curr && attr == hwmon_curr_label) ||
380 (type == hwmon_power && attr == hwmon_power_label) ||
381 (type == hwmon_energy && attr == hwmon_energy_label) ||
382 (type == hwmon_humidity && attr == hwmon_humidity_label) ||
383 (type == hwmon_fan && attr == hwmon_fan_label);
386 static struct attribute *hwmon_genattr(const void *drvdata,
387 enum hwmon_sensor_types type,
390 const char *template,
391 const struct hwmon_ops *ops)
393 struct hwmon_device_attribute *hattr;
394 struct device_attribute *dattr;
398 bool is_string = is_string_attr(type, attr);
400 /* The attribute is invisible if there is no template string */
402 return ERR_PTR(-ENOENT);
404 mode = ops->is_visible(drvdata, type, attr, index);
406 return ERR_PTR(-ENOENT);
408 if ((mode & 0444) && ((is_string && !ops->read_string) ||
409 (!is_string && !ops->read)))
410 return ERR_PTR(-EINVAL);
411 if ((mode & 0222) && !ops->write)
412 return ERR_PTR(-EINVAL);
414 hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
416 return ERR_PTR(-ENOMEM);
418 if (type == hwmon_chip) {
421 scnprintf(hattr->name, sizeof(hattr->name), template,
422 index + hwmon_attr_base(type));
428 hattr->index = index;
431 dattr = &hattr->dev_attr;
432 dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
433 dattr->store = hwmon_attr_store;
444 * Chip attributes are not attribute templates but actual sysfs attributes.
445 * See hwmon_genattr() for special handling.
447 static const char * const hwmon_chip_attrs[] = {
448 [hwmon_chip_temp_reset_history] = "temp_reset_history",
449 [hwmon_chip_in_reset_history] = "in_reset_history",
450 [hwmon_chip_curr_reset_history] = "curr_reset_history",
451 [hwmon_chip_power_reset_history] = "power_reset_history",
452 [hwmon_chip_update_interval] = "update_interval",
453 [hwmon_chip_alarms] = "alarms",
454 [hwmon_chip_samples] = "samples",
455 [hwmon_chip_curr_samples] = "curr_samples",
456 [hwmon_chip_in_samples] = "in_samples",
457 [hwmon_chip_power_samples] = "power_samples",
458 [hwmon_chip_temp_samples] = "temp_samples",
461 static const char * const hwmon_temp_attr_templates[] = {
462 [hwmon_temp_enable] = "temp%d_enable",
463 [hwmon_temp_input] = "temp%d_input",
464 [hwmon_temp_type] = "temp%d_type",
465 [hwmon_temp_lcrit] = "temp%d_lcrit",
466 [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
467 [hwmon_temp_min] = "temp%d_min",
468 [hwmon_temp_min_hyst] = "temp%d_min_hyst",
469 [hwmon_temp_max] = "temp%d_max",
470 [hwmon_temp_max_hyst] = "temp%d_max_hyst",
471 [hwmon_temp_crit] = "temp%d_crit",
472 [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
473 [hwmon_temp_emergency] = "temp%d_emergency",
474 [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
475 [hwmon_temp_alarm] = "temp%d_alarm",
476 [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
477 [hwmon_temp_min_alarm] = "temp%d_min_alarm",
478 [hwmon_temp_max_alarm] = "temp%d_max_alarm",
479 [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
480 [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
481 [hwmon_temp_fault] = "temp%d_fault",
482 [hwmon_temp_offset] = "temp%d_offset",
483 [hwmon_temp_label] = "temp%d_label",
484 [hwmon_temp_lowest] = "temp%d_lowest",
485 [hwmon_temp_highest] = "temp%d_highest",
486 [hwmon_temp_reset_history] = "temp%d_reset_history",
487 [hwmon_temp_rated_min] = "temp%d_rated_min",
488 [hwmon_temp_rated_max] = "temp%d_rated_max",
491 static const char * const hwmon_in_attr_templates[] = {
492 [hwmon_in_enable] = "in%d_enable",
493 [hwmon_in_input] = "in%d_input",
494 [hwmon_in_min] = "in%d_min",
495 [hwmon_in_max] = "in%d_max",
496 [hwmon_in_lcrit] = "in%d_lcrit",
497 [hwmon_in_crit] = "in%d_crit",
498 [hwmon_in_average] = "in%d_average",
499 [hwmon_in_lowest] = "in%d_lowest",
500 [hwmon_in_highest] = "in%d_highest",
501 [hwmon_in_reset_history] = "in%d_reset_history",
502 [hwmon_in_label] = "in%d_label",
503 [hwmon_in_alarm] = "in%d_alarm",
504 [hwmon_in_min_alarm] = "in%d_min_alarm",
505 [hwmon_in_max_alarm] = "in%d_max_alarm",
506 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
507 [hwmon_in_crit_alarm] = "in%d_crit_alarm",
508 [hwmon_in_rated_min] = "in%d_rated_min",
509 [hwmon_in_rated_max] = "in%d_rated_max",
512 static const char * const hwmon_curr_attr_templates[] = {
513 [hwmon_curr_enable] = "curr%d_enable",
514 [hwmon_curr_input] = "curr%d_input",
515 [hwmon_curr_min] = "curr%d_min",
516 [hwmon_curr_max] = "curr%d_max",
517 [hwmon_curr_lcrit] = "curr%d_lcrit",
518 [hwmon_curr_crit] = "curr%d_crit",
519 [hwmon_curr_average] = "curr%d_average",
520 [hwmon_curr_lowest] = "curr%d_lowest",
521 [hwmon_curr_highest] = "curr%d_highest",
522 [hwmon_curr_reset_history] = "curr%d_reset_history",
523 [hwmon_curr_label] = "curr%d_label",
524 [hwmon_curr_alarm] = "curr%d_alarm",
525 [hwmon_curr_min_alarm] = "curr%d_min_alarm",
526 [hwmon_curr_max_alarm] = "curr%d_max_alarm",
527 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
528 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
529 [hwmon_curr_rated_min] = "curr%d_rated_min",
530 [hwmon_curr_rated_max] = "curr%d_rated_max",
533 static const char * const hwmon_power_attr_templates[] = {
534 [hwmon_power_enable] = "power%d_enable",
535 [hwmon_power_average] = "power%d_average",
536 [hwmon_power_average_interval] = "power%d_average_interval",
537 [hwmon_power_average_interval_max] = "power%d_interval_max",
538 [hwmon_power_average_interval_min] = "power%d_interval_min",
539 [hwmon_power_average_highest] = "power%d_average_highest",
540 [hwmon_power_average_lowest] = "power%d_average_lowest",
541 [hwmon_power_average_max] = "power%d_average_max",
542 [hwmon_power_average_min] = "power%d_average_min",
543 [hwmon_power_input] = "power%d_input",
544 [hwmon_power_input_highest] = "power%d_input_highest",
545 [hwmon_power_input_lowest] = "power%d_input_lowest",
546 [hwmon_power_reset_history] = "power%d_reset_history",
547 [hwmon_power_accuracy] = "power%d_accuracy",
548 [hwmon_power_cap] = "power%d_cap",
549 [hwmon_power_cap_hyst] = "power%d_cap_hyst",
550 [hwmon_power_cap_max] = "power%d_cap_max",
551 [hwmon_power_cap_min] = "power%d_cap_min",
552 [hwmon_power_min] = "power%d_min",
553 [hwmon_power_max] = "power%d_max",
554 [hwmon_power_lcrit] = "power%d_lcrit",
555 [hwmon_power_crit] = "power%d_crit",
556 [hwmon_power_label] = "power%d_label",
557 [hwmon_power_alarm] = "power%d_alarm",
558 [hwmon_power_cap_alarm] = "power%d_cap_alarm",
559 [hwmon_power_min_alarm] = "power%d_min_alarm",
560 [hwmon_power_max_alarm] = "power%d_max_alarm",
561 [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
562 [hwmon_power_crit_alarm] = "power%d_crit_alarm",
563 [hwmon_power_rated_min] = "power%d_rated_min",
564 [hwmon_power_rated_max] = "power%d_rated_max",
567 static const char * const hwmon_energy_attr_templates[] = {
568 [hwmon_energy_enable] = "energy%d_enable",
569 [hwmon_energy_input] = "energy%d_input",
570 [hwmon_energy_label] = "energy%d_label",
573 static const char * const hwmon_humidity_attr_templates[] = {
574 [hwmon_humidity_enable] = "humidity%d_enable",
575 [hwmon_humidity_input] = "humidity%d_input",
576 [hwmon_humidity_label] = "humidity%d_label",
577 [hwmon_humidity_min] = "humidity%d_min",
578 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
579 [hwmon_humidity_max] = "humidity%d_max",
580 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
581 [hwmon_humidity_alarm] = "humidity%d_alarm",
582 [hwmon_humidity_fault] = "humidity%d_fault",
583 [hwmon_humidity_rated_min] = "humidity%d_rated_min",
584 [hwmon_humidity_rated_max] = "humidity%d_rated_max",
587 static const char * const hwmon_fan_attr_templates[] = {
588 [hwmon_fan_enable] = "fan%d_enable",
589 [hwmon_fan_input] = "fan%d_input",
590 [hwmon_fan_label] = "fan%d_label",
591 [hwmon_fan_min] = "fan%d_min",
592 [hwmon_fan_max] = "fan%d_max",
593 [hwmon_fan_div] = "fan%d_div",
594 [hwmon_fan_pulses] = "fan%d_pulses",
595 [hwmon_fan_target] = "fan%d_target",
596 [hwmon_fan_alarm] = "fan%d_alarm",
597 [hwmon_fan_min_alarm] = "fan%d_min_alarm",
598 [hwmon_fan_max_alarm] = "fan%d_max_alarm",
599 [hwmon_fan_fault] = "fan%d_fault",
602 static const char * const hwmon_pwm_attr_templates[] = {
603 [hwmon_pwm_input] = "pwm%d",
604 [hwmon_pwm_enable] = "pwm%d_enable",
605 [hwmon_pwm_mode] = "pwm%d_mode",
606 [hwmon_pwm_freq] = "pwm%d_freq",
609 static const char * const hwmon_intrusion_attr_templates[] = {
610 [hwmon_intrusion_alarm] = "intrusion%d_alarm",
611 [hwmon_intrusion_beep] = "intrusion%d_beep",
614 static const char * const *__templates[] = {
615 [hwmon_chip] = hwmon_chip_attrs,
616 [hwmon_temp] = hwmon_temp_attr_templates,
617 [hwmon_in] = hwmon_in_attr_templates,
618 [hwmon_curr] = hwmon_curr_attr_templates,
619 [hwmon_power] = hwmon_power_attr_templates,
620 [hwmon_energy] = hwmon_energy_attr_templates,
621 [hwmon_humidity] = hwmon_humidity_attr_templates,
622 [hwmon_fan] = hwmon_fan_attr_templates,
623 [hwmon_pwm] = hwmon_pwm_attr_templates,
624 [hwmon_intrusion] = hwmon_intrusion_attr_templates,
627 static const int __templates_size[] = {
628 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
629 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
630 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
631 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
632 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
633 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
634 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
635 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
636 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
637 [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
640 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
641 u32 attr, int channel)
643 char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];
644 char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
645 char *envp[] = { event, NULL };
646 const char * const *templates;
647 const char *template;
650 if (type >= ARRAY_SIZE(__templates))
652 if (attr >= __templates_size[type])
655 templates = __templates[type];
656 template = templates[attr];
658 base = hwmon_attr_base(type);
660 scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
661 scnprintf(event, sizeof(event), "NAME=%s", sattr);
662 sysfs_notify(&dev->kobj, NULL, sattr);
663 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
665 if (type == hwmon_temp)
666 hwmon_thermal_notify(dev, channel);
670 EXPORT_SYMBOL_GPL(hwmon_notify_event);
672 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
676 for (i = n = 0; info->config[i]; i++)
677 n += hweight32(info->config[i]);
682 static int hwmon_genattrs(const void *drvdata,
683 struct attribute **attrs,
684 const struct hwmon_ops *ops,
685 const struct hwmon_channel_info *info)
687 const char * const *templates;
691 if (info->type >= ARRAY_SIZE(__templates))
694 templates = __templates[info->type];
695 template_size = __templates_size[info->type];
697 for (i = 0; info->config[i]; i++) {
698 u32 attr_mask = info->config[i];
704 attr = __ffs(attr_mask);
705 attr_mask &= ~BIT(attr);
706 if (attr >= template_size)
708 a = hwmon_genattr(drvdata, info->type, attr, i,
709 templates[attr], ops);
711 if (PTR_ERR(a) != -ENOENT)
721 static struct attribute **
722 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
724 int ret, i, aindex = 0, nattrs = 0;
725 struct attribute **attrs;
727 for (i = 0; chip->info[i]; i++)
728 nattrs += hwmon_num_channel_attrs(chip->info[i]);
731 return ERR_PTR(-EINVAL);
733 attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
735 return ERR_PTR(-ENOMEM);
737 for (i = 0; chip->info[i]; i++) {
738 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
741 hwmon_free_attrs(attrs);
750 static struct device *
751 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
752 const struct hwmon_chip_info *chip,
753 const struct attribute_group **groups)
755 struct hwmon_device *hwdev;
760 /* Complain about invalid characters in hwmon name attribute */
761 if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
763 "hwmon: '%s' is not a valid name attribute, please fix\n",
766 id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
770 hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
779 struct attribute **attrs;
780 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
783 for (i = 0; groups[i]; i++)
786 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
787 if (!hwdev->groups) {
792 attrs = __hwmon_create_attrs(drvdata, chip);
794 err = PTR_ERR(attrs);
798 hwdev->group.attrs = attrs;
800 hwdev->groups[ngroups++] = &hwdev->group;
803 for (i = 0; groups[i]; i++)
804 hwdev->groups[ngroups++] = groups[i];
807 hdev->groups = hwdev->groups;
809 hdev->groups = groups;
812 if (dev && device_property_present(dev, "label")) {
813 err = device_property_read_string(dev, "label", &label);
817 hwdev->label = kstrdup(label, GFP_KERNEL);
818 if (hwdev->label == NULL) {
825 hdev->class = &hwmon_class;
827 hdev->of_node = dev ? dev->of_node : NULL;
829 dev_set_drvdata(hdev, drvdata);
830 dev_set_name(hdev, HWMON_ID_FORMAT, id);
831 err = device_register(hdev);
837 INIT_LIST_HEAD(&hwdev->tzdata);
839 if (dev && dev->of_node && chip && chip->ops->read &&
840 chip->info[0]->type == hwmon_chip &&
841 (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
842 err = hwmon_thermal_register_sensors(hdev);
844 device_unregister(hdev);
846 * Don't worry about hwdev; hwmon_dev_release(), called
847 * from device_unregister(), will free it.
856 hwmon_dev_release(hdev);
858 ida_simple_remove(&hwmon_ida, id);
863 * hwmon_device_register_with_groups - register w/ hwmon
864 * @dev: the parent device
865 * @name: hwmon name attribute
866 * @drvdata: driver data to attach to created device
867 * @groups: List of attribute groups to create
869 * hwmon_device_unregister() must be called when the device is no
872 * Returns the pointer to the new device.
875 hwmon_device_register_with_groups(struct device *dev, const char *name,
877 const struct attribute_group **groups)
880 return ERR_PTR(-EINVAL);
882 return __hwmon_device_register(dev, name, drvdata, NULL, groups);
884 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
887 * hwmon_device_register_with_info - register w/ hwmon
888 * @dev: the parent device
889 * @name: hwmon name attribute
890 * @drvdata: driver data to attach to created device
891 * @chip: pointer to hwmon chip information
892 * @extra_groups: pointer to list of additional non-standard attribute groups
894 * hwmon_device_unregister() must be called when the device is no
897 * Returns the pointer to the new device.
900 hwmon_device_register_with_info(struct device *dev, const char *name,
902 const struct hwmon_chip_info *chip,
903 const struct attribute_group **extra_groups)
906 return ERR_PTR(-EINVAL);
908 if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
909 return ERR_PTR(-EINVAL);
912 return ERR_PTR(-EINVAL);
914 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
916 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
919 * hwmon_device_register - register w/ hwmon
920 * @dev: the device to register
922 * hwmon_device_unregister() must be called when the device is no
925 * Returns the pointer to the new device.
927 struct device *hwmon_device_register(struct device *dev)
930 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
932 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
934 EXPORT_SYMBOL_GPL(hwmon_device_register);
937 * hwmon_device_unregister - removes the previously registered class device
939 * @dev: the class device to destroy
941 void hwmon_device_unregister(struct device *dev)
945 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
946 device_unregister(dev);
947 ida_simple_remove(&hwmon_ida, id);
950 "hwmon_device_unregister() failed: bad class ID!\n");
952 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
954 static void devm_hwmon_release(struct device *dev, void *res)
956 struct device *hwdev = *(struct device **)res;
958 hwmon_device_unregister(hwdev);
962 * devm_hwmon_device_register_with_groups - register w/ hwmon
963 * @dev: the parent device
964 * @name: hwmon name attribute
965 * @drvdata: driver data to attach to created device
966 * @groups: List of attribute groups to create
968 * Returns the pointer to the new device. The new device is automatically
969 * unregistered with the parent device.
972 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
974 const struct attribute_group **groups)
976 struct device **ptr, *hwdev;
979 return ERR_PTR(-EINVAL);
981 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
983 return ERR_PTR(-ENOMEM);
985 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
990 devres_add(dev, ptr);
997 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
1000 * devm_hwmon_device_register_with_info - register w/ hwmon
1001 * @dev: the parent device
1002 * @name: hwmon name attribute
1003 * @drvdata: driver data to attach to created device
1004 * @chip: pointer to hwmon chip information
1005 * @groups: pointer to list of driver specific attribute groups
1007 * Returns the pointer to the new device. The new device is automatically
1008 * unregistered with the parent device.
1011 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
1013 const struct hwmon_chip_info *chip,
1014 const struct attribute_group **groups)
1016 struct device **ptr, *hwdev;
1019 return ERR_PTR(-EINVAL);
1021 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1023 return ERR_PTR(-ENOMEM);
1025 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
1031 devres_add(dev, ptr);
1039 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
1041 static int devm_hwmon_match(struct device *dev, void *res, void *data)
1043 struct device **hwdev = res;
1045 return *hwdev == data;
1049 * devm_hwmon_device_unregister - removes a previously registered hwmon device
1051 * @dev: the parent device of the device to unregister
1053 void devm_hwmon_device_unregister(struct device *dev)
1055 WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
1057 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
1059 static void __init hwmon_pci_quirks(void)
1061 #if defined CONFIG_X86 && defined CONFIG_PCI
1066 /* Open access to 0x295-0x296 on MSI MS-7031 */
1067 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
1069 if (sb->subsystem_vendor == 0x1462 && /* MSI */
1070 sb->subsystem_device == 0x0031) { /* MS-7031 */
1071 pci_read_config_byte(sb, 0x48, &enable);
1072 pci_read_config_word(sb, 0x64, &base);
1074 if (base == 0 && !(enable & BIT(2))) {
1076 "Opening wide generic port at 0x295\n");
1077 pci_write_config_word(sb, 0x64, 0x295);
1078 pci_write_config_byte(sb, 0x48,
1087 static int __init hwmon_init(void)
1093 err = class_register(&hwmon_class);
1095 pr_err("couldn't register hwmon sysfs class\n");
1101 static void __exit hwmon_exit(void)
1103 class_unregister(&hwmon_class);
1106 subsys_initcall(hwmon_init);
1107 module_exit(hwmon_exit);
1109 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1110 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1111 MODULE_LICENSE("GPL");